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w in (-oo:+oo)
7*(-(4*w)-7) = -273 // + 273
7*(-(4*w)-7)+273 = 0
7*(-4*w-7)+273 = 0
7*(-4*w-7)+273 = 0
224-28*w = 0
224-28*w = 0
224-28*w = 0 // - 224
-28*w = -224 // : -28
w = -224/(-28)
w = 8
w = 8
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